package collections;/*
 * Copyright 2020-2030 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import java.util.Objects;
import java.util.function.Predicate;

/**
 * @author Neil Wang
 * @version 1.0.0
 * @date 2021/6/11 9:44 上午
 */
public interface Collection<T> extends Iterable<T> {

    int size();

    boolean isEmpty();

    boolean contains(Object o);

    Iterator<T> iterator();

    Object[] toArray();

    <E> E[] toArray(E[] a);

    boolean add(T t);

    boolean remove(Object o);

    boolean containsAll(Collection<?> c);

    boolean addAll(Collection<?> c);

    boolean removeAll(Collection<?> c);

    default boolean removeIf(Predicate<? super T> filter) {
        Objects.requireNonNull(filter);
        Iterator<T> each = iterator();
        boolean removed = false;
        while (each.hasNext()) {
            if (filter.test(each.next())) {
                each.remove();
                removed = true;
            }
        }
        return removed;
    }

    boolean retainAll(Collection<?> c);

    void clear();

    boolean equals(Object o);

    int hashCode();

    //TODO:Spliterator

    //TODO:Stream

    //TODO:parallelStream
}
